Updating exception debugging to reflect changes due to http://bugzilla.mozilla.org/show_bug.cgi?id=210605 .

js/rhino/toolsrc/org/mozilla/javascript/tools/debugger/Main.java

@@ -2619,7 +2619,6 @@ public class Main extends JFrame implements Debugger, ContextListener {
         return item;
     }
 
-
     void handleBreakpointHit(Context cx) {
         breakFlag = false;
         interrupted(cx);
@@ -2628,20 +2627,15 @@ public class Main extends JFrame implements Debugger, ContextListener {
     private static Object unwrapException(Object ex) {
         for (;;) {
             if (ex instanceof JavaScriptException) {
-                ex = ScriptRuntime.unwrapJavaScriptException
-                            ((JavaScriptException)ex);
+                ex = ((JavaScriptException)ex).getValue();
             } else if (ex instanceof EcmaError) {
                 ex = ((EcmaError)ex).getErrorObject();
             } else if (ex instanceof NativeJavaObject) {
                 ex = ((NativeJavaObject)ex).unwrap();
                 break;
             } else if (ex instanceof WrappedException) {
-                Object w = ((WrappedException)ex).unwrap();
-                if (w instanceof Throwable) {
-                    ex = w;
+                ex = ((WrappedException)ex).getWrappedException();
                 continue;
-                }
-                break;
             } else {
                 break;
             }